BELARUS-
1523/1523В
/1523.3
/1523В.3
Troubleshooting
233
Trouble, symptoms
Remedy
phragm assembly.
Absence of clearance between the dis-
charge piston and the bottom cover; the
outlet holes in the cover are clogged.
Screw off the cover, clean the outlet holes
and check the clearance.
No air is supplied to the coupling hose through the air-intake valve:
The stem of the air-intake valve in the pres-
sure regulator is sunk insufficiently.
Screw the nut of the coupling hose fully
down onto union.
The pressure regulator has switched the
compressor to idling.
Reduce the pressure in the receiver to be-
low 0.65 MPa (6.5 kgf/cm
2
).
Displacement of the rubber ring on the air-
intake valve.
Screw out the cover and check the position
of the O-ring and its condition..
The trailer’s brakes are ineffective:
The brake valve fails to maintain the pres-
sure in the control mainline at the level of
0.77...0.80 MPa (7.7...8.0 kgf/cm
2
).
Adjust the brake valve and its actuator (see
Section “Construction and Operation of
Tractor Components”, item “Checking and
Adjusting the Brake Valve of the Pneumatic
System and Its Actuator”).
The brake valve fails to drop the pressure in
the coupling mainline to zero.
Adjust the brake valve and its actuator (see
Section “Construction and Operation of
Tractor Components”, item “Checking and
Adjusting the Brake Valve of the Pneumatic
System and Its Actuator”).
The pressure in the coupling mainline drops
to zero too slowly.
Check the condition of the mainline, atmos-
pheric opening in the valve and the pedal
travel.
The operation of the trailer’s brake system
is disturbed.
Perform the adjustment.
The trailer’s brakes are released too slowly:
Maladjustment of the brake valve and its
actuator.
Perform the adjustment (see Section “Con-
struction and Operation of Tractor Compo-
nents”, item “Checking and Adjusting the
Brake Valve of the Pneumatic System and
Its Actuator”).
The operation of the trailer’s brake system
is disturbed.
Perform the adjustment (see Section “Con-
struction and Operation of Tractor Compo-
nents”, item “Checking and Adjusting the
Brake Valve of the Pneumatic System and
Its Actuator”).
Air-conditioner
The electromagnetic clutch of the compressor fails to operate (when turning the
temperature regulator, no distinctive metallic click is heard):
Electric equipment failure.
Check the operability of the block of pres-
sure sensors by means of a tester or mul-
timeter; the leads of the block of sensors
(red and pink wires) shall be rung out be-
tween one another.
Check the intactness of the connections of
the electric circuits from the compressor
coupling to the air conditioner control panel.
Summary of Contents for 1523
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